US20130176197A1 - Display driving apparatus and method for driving display panel - Google Patents

Display driving apparatus and method for driving display panel Download PDF

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Publication number
US20130176197A1
US20130176197A1 US13/736,069 US201313736069A US2013176197A1 US 20130176197 A1 US20130176197 A1 US 20130176197A1 US 201313736069 A US201313736069 A US 201313736069A US 2013176197 A1 US2013176197 A1 US 2013176197A1
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Prior art keywords
driving
frame period
scanning signals
gate scanning
sub
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Abandoned
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US13/736,069
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English (en)
Inventor
Jen-Chieh Hu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novatek Microelectronics Corp
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Novatek Microelectronics Corp
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Assigned to NOVATEK MICROELECTRONICS CORP. reassignment NOVATEK MICROELECTRONICS CORP. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HU, JEN-CHIEH
Publication of US20130176197A1 publication Critical patent/US20130176197A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3648—Control of matrices with row and column drivers using an active matrix
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2230/00—Details of flat display driving waveforms
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0224—Details of interlacing
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3614—Control of polarity reversal in general

Definitions

  • the invention generally relates to a display driving apparatus and a method for driving a display panel, and more particularly, to a liquid crystal display (LCD) driving apparatus and a method for driving a display panel.
  • LCD liquid crystal display
  • FIG. 1A is a diagram of a conventional liquid crystal display (LCD) device 100 .
  • the LCD panel 110 of the LCD device 100 includes a plurality of pixels arranged into an array, and the LCD panel 110 is driven according to gate scanning signals G 1 -G 4 and source driving signals SN 1 and SN 2 .
  • the gate scanning signals G 1 -G 4 are sequentially activated (i.e., boosted to a high voltage level) during a frame period to sequentially turn on the thin film transistors (TFTs) corresponding to the pixels on the LCD panel 110 .
  • the source driving signals SN 1 and SN 2 produce corresponding voltage values according to the grayscale values to be displayed in response to the activation of the gate scanning signals G 1 -G 4 .
  • FIG. 1B illustrates waveforms of the source driving signals SN 1 and SN 2 .
  • the source driving signal SN 1 needs to periodically transition between the positive driving voltages V 11 and V 91 in response to the activation of the gate scanning signals G 1 -G 4
  • the source driving signal SN 2 needs to periodically transition between the negative driving voltages V 12 and V 92 in response to the activation of the gate scanning signals G 1 -G 4 , wherein the driving voltages V 11 and V 92 allow the corresponding pixels to be brightened.
  • the constant transition of the source driving signals SN 1 and SN 2 causes the power consumption of the LCD device 100 to increase drastically and increases the temperature of the LCD device 100 . As a result, the efficiency of the LCD device 100 is seriously impacted.
  • the invention is directed to a display driving apparatus and a method for driving a display panel, in which the power consumption is effectively reduced.
  • the invention provides a display driving apparatus for driving a display panel.
  • the display driving apparatus includes a controller, a source driving circuit, and a gate driving circuit.
  • the controller receives a display data and enables a specific driving mode when the display data is a specific display mode data.
  • the source driving circuit is coupled to the controller and the display panel.
  • the source driving circuit generates a plurality of source driving signals.
  • the specific driving mode is enabled, the source driving circuit makes each of the source driving signals to hold at one of a plurality of DC driving voltages during a first sub-frame period of a frame period and hold at another one of the DC driving voltages during a second sub-frame period of the frame period.
  • the gate driving circuit is coupled to the controller and the display panel.
  • the gate driving circuit generates a plurality of gate scanning signals.
  • the gate driving circuit masks a plurality of first part gate scanning signals among the gate scanning signals during the first sub-frame period and masks a plurality of second part gate scanning signals other than the first part gate scanning signals during the second sub-frame period.
  • the invention also provides a method for driving a display panel.
  • the method includes following steps.
  • a display data is received, and a specific driving mode is enabled when the display data is a specific display mode data.
  • each of a plurality of source driving signals is made to hold at one of a plurality of DC driving voltages during a first sub-frame period of a frame period and hold at another one of the DC driving voltages during a second sub-frame period of the frame period.
  • a plurality of gate scanning signals is generated, and in the specific driving mode, a plurality of first part gate scanning signals among the gate scanning signals is masked during the first sub-frame period, and a plurality of second part gate scanning signals other than the first part gate scanning signals is masked during the second sub-frame period.
  • a specific driving mode is enabled and source driving signals are maintained at DC driving voltages during sub-frame periods.
  • FIG. 1A is a diagram of a conventional liquid crystal display (LCD) device 100 .
  • FIG. 1B illustrates waveforms of source driving signals SN 1 and SN 2 .
  • FIG. 2 is a diagram of a display driving apparatus 200 according to an embodiment of the invention.
  • FIG. 3A and FIG. 3B are diagrams of specific display images.
  • FIGS. 4A-6 illustrate different driving waveforms of the display driving apparatus 200 .
  • FIG. 7 is a flowchart of a method for driving a display panel according to an embodiment of the invention.
  • FIG. 2 is a diagram of a display driving apparatus 200 according to an embodiment of the invention.
  • the display driving apparatus 200 includes a controller 210 , a source driving circuit 220 , and a gate driving circuit 230 .
  • the display driving apparatus 200 is configured to drive a display panel 201 .
  • the controller 210 receives a display data DDATA and determines whether or not the display data DDATA is a specific display mode data corresponding to a specific display image.
  • the controller 210 enables a specific driving mode when the display data DDATA is determined to be a specific display mode data.
  • FIG. 3A and FIG. 3B are diagrams illustrating specific display images.
  • FIG. 3A is a diagram of a lattice image
  • FIG. 3B is a diagram of a horizontal line image.
  • a specific display image includes a completely dark image and a completely bright image (i.e., all pixels on the display panel 201 display dark spots or bright spots).
  • the source driving circuit 220 is coupled to the controller 210 and the display panel 201 .
  • the source driving circuit 220 generates a plurality of source driving signals to drive the display panel 201 .
  • each source driving signal generated by the source driving circuit 220 is maintained at one of a plurality of DC driving voltages during a first sub-frame period of a frame period and is maintained at another one of the DC driving voltages during a second sub-frame period of the same frame period.
  • the gate driving circuit 230 is coupled to the controller 210 and the display panel 201 .
  • the gate driving circuit 230 generates a plurality of gate scanning signals to scan the display panel 201 .
  • the gate driving circuit 230 masks a plurality of first part gate scanning signals among the gate scanning signals during the first sub-frame period and masks a plurality of second part gate scanning signals other than the first part gate scanning signals during the second sub-frame period.
  • FIG. 4A illustrates a driving waveform of the display driving apparatus 200 .
  • a polarity signal POL is maintained at a low level.
  • the frame period TP includes a first sub-frame period TSP 1 and a second sub-frame period TSP 2 .
  • start pulse signals STV 1 and STV 2 are respectively provided at the beginning of the first sub-frame period TSP 1 and the beginning of the second sub-frame period TSP 2 to respectively activate the scanning operation of the odd number gate scanning signals G 1 , G 3 , and G 5 and the even number gate scanning signals G 2 , G 4 , and G 6 .
  • the mask enabling signals OE 1 and OE 2 are respectively used for masking the scanning action of the odd number gate scanning signals G 1 , G 3 , and G 5 and the even number gate scanning signals G 2 , G 4 , and G 6 .
  • the mask enabling signal OE 1 is at a logic high level
  • the effect for activating (boosting to a high voltage level) the gate scanning signals G 1 , G 3 , and G 5 is masked.
  • the mask enabling signal OE 2 is at a logic high level, the effect for activating (boosting to a high voltage level) the gate scanning signals G 2 , G 4 , and G 6 is masked.
  • the controller 210 when the controller 210 detects that the display data DDATA is a specific display mode data used for displaying a horizontal line image, the controller 210 enables a specific driving mode and provides the mask enabling signals OE 1 and OE 2 correspondingly, as shown in FIG. 4A . It should be noted that during the first sub-frame period TSP 1 , the mask enabling signal OE 1 holds a regular periodic pulse signal, while the mask enabling signal OE 2 is a DC signal holding at a logic high level.
  • the gate scanning signals G 1 , G 3 , and G 5 keep their regular activation/deactivation actions while the gate scanning signals G 2 , G 4 , and G 6 are masked therefore hold at a low voltage level (deactivated state).
  • the mask enabling signal OE 2 holds a regular periodic pulse signal, while the mask enabling signal OE 1 is a DC signal holding at a logic high level.
  • the gate scanning signals G 2 , G 4 , and G 6 keep their regular activation/deactivation actions while the gate scanning signals G 1 , G 3 , and G 5 are masked therefore hold at a low voltage level (deactivated state).
  • the source driving signals SN 1 and SN 2 in FIG. 4A are respectively an odd number source driving signal and an even number source driving signal. Because a horizontal line image is displayed on the display panel 201 , all the odd number source driving signals have the same waveform, and all the even number source driving signals also have the same waveform.
  • the source driving signals SN 1 and SN 2 respectively hold at DC driving voltages V 18 and V 1 to allow the pixels to present bright spots
  • the source driving signals SN 1 and SN 2 respectively hold at DC driving voltages V 10 and V 9 to allow the pixels to present dark spots.
  • the DC driving voltages V 18 and V 1 are respectively driving voltages for lightening pixels at different driving polarities
  • the DC driving voltages V 10 and V 9 are respectively driving voltages for darkening pixels at different driving polarities, wherein the DC driving voltages V 1 and V 9 have the same driving polarity, and the DC driving voltages V 10 and V 18 have the same driving polarity.
  • the source driving signals SN 1 and SN 2 are controlled to present different driving polarities during the same sub-frame period in order to accomplish an implementation of column inversion.
  • the invention is not limited thereto, and the source driving signals SN 1 and SN 2 may not present different driving polarities during the same sub-frame period.
  • FIG. 4B illustrates another driving waveform of the display driving apparatus 200 . It can be understood by referring to FIG. 4B that the masking of part of the gate scanning signals may be accomplished without the mask enabling signal OE 1 or OE 2 .
  • the controller 210 after the controller 210 enables the specific driving mode, it provides the start pulse signals STV 1 and STV 2 (as shown in FIG. 4B ) to respectively mask the gate scanning signals G 2 , G 4 , and G 6 or the gate scanning signals G 1 , G 3 , and G 5 .
  • the controller 210 transmits a regular start pulse signal STV 1 to the gate driving circuit 230 and provides a start pulse signal STV 2 holding at a logic low level to the gate driving circuit 230 . Accordingly, the gate driving circuit 230 generates regular gate scanning signals G 1 , G 3 , and G 5 according to the pulse P 1 of the start pulse signal STV 1 . However, since the start pulse signal STV 2 has no effective pulse during the first sub-frame period TSP 1 , the gate driving circuit 230 cannot generate the gate scanning signals G 2 , G 4 , and G 6 for sequential scanning. Accordingly, the gate scanning signals G 2 , G 4 , and G 6 hold masked.
  • the controller 210 transmits a regular start pulse signal STV 2 to the gate driving circuit 230 and provides a start pulse signal STV 1 holding at a logic low level to the gate driving circuit 230 . Accordingly, the gate driving circuit 230 generates regular gate scanning signals G 2 , G 4 , and G 6 according to the pulse P 2 of the start pulse signal STV 2 . However, since the start pulse signal STV 1 has no effective pulse during the second sub-frame period TSP 2 , the gate driving circuit 230 cannot generate the gate scanning signals G 1 , G 3 , and G 5 for sequential scanning. Accordingly, the gate scanning signals G 1 , G 3 , and G 5 hold masked.
  • FIG. 5 illustrates another driving waveform of the display driving apparatus 200 .
  • FIG. 5 illustrates the driving waveform when a lattice image is displayed on the display panel 201 .
  • the gate scanning signals G 1 -G 6 are controlled in a same way as that in the implementation illustrated in FIG. 4A therefore will not be described herein.
  • the source driving signals SN 1 and SN 2 assuming that the source driving signal SN 1 is an odd number source driving signal and the source driving signal SN 2 is an even number source driving signal, during the first sub-frame period TSP 1 , the source driving signal SN 1 holds at the DC driving voltage V 18 , and the source driving signal SN 2 holds at the DC driving voltage V 9 .
  • the odd number pixels in the rows corresponding to the gate scanning signals G 1 , G 3 , and G 5 on the display panel 201 present bright spots
  • the even number pixels in the rows corresponding to the gate scanning signals G 1 , G 3 , and G 5 on the display panel 201 present dark spots.
  • the source driving signal SN 1 holds at the DC driving voltage V 10
  • the source driving signal SN 2 holds at the DC driving voltage V 1 .
  • the odd number pixels in the rows corresponding to the gate scanning signals G 2 , G 4 , and G 6 on the display panel 201 present dark spots
  • the even number pixels in the rows corresponding to the gate scanning signals G 2 , G 4 , and G 6 on the display panel 201 present bright spots. Thereby, a complete lattice image is displayed on the display panel 201 .
  • FIG. 6 illustrates another driving waveform of the display driving apparatus 200 .
  • FIG. 6 illustrates the driving waveform when a completely bright image is displayed on the display panel 201 .
  • the source driving signal SN 1 always holds at the DC driving voltage V 18 and the source driving signal SN 2 always holds at the DC driving voltage V 1 .
  • the source driving signal SN 1 always holds at the DC driving voltage V 18 and the source driving signal SN 2 always holds at the DC driving voltage V 1 .
  • all the pixels on the display panel 201 always present bright spots. Accordingly, a completely bright image is displayed.
  • the source driving signals SN 1 and SN 2 are simply switched to respectively hold at the DC driving voltages V 1 and V 18 during the next frame period.
  • the source driving signal SN 1 is controlled to hold at the DC driving voltage V 10 or V 9 during the same frame period
  • the source driving signal SN 2 is controlled to hold at the DC driving voltage V 10 or V 9 during the same frame period (the source driving signals SN 1 and SN 2 may not be the same).
  • FIG. 7 is a flowchart of a method for driving a display panel according to an embodiment of the invention.
  • the method includes following steps. First, a display data is received, and a specific driving mode is enabled when the display data is a specific display mode data (S 710 ). Then, in the specific driving mode, each of a plurality of source driving signals is maintained at one of a plurality of DC driving voltages during a first sub-frame period of a frame period and at another one of the DC driving voltages during a second sub-frame period of the frame period (S 720 ).
  • a plurality of gate scanning signals is generated, and in the specific driving mode, a plurality of first part gate scanning signals among the gate scanning signals is masked during the first sub-frame period, and a plurality of second part gate scanning signals other than the first part gate scanning signals is masked during the second sub-frame period (S 730 ).
  • part of the gate scanning signals is masked during each sub-frame period, and a source driving signal is generated according to the unmasked gate scanning signals.
  • a specific driving mode the number of transitions of the source driving signals, and accordingly the power consumption, is effectively reduced. Thereby, the performance of the display driving apparatus is improved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
US13/736,069 2012-01-09 2013-01-08 Display driving apparatus and method for driving display panel Abandoned US20130176197A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TW101100821 2012-01-09
TW101100821A TWI463453B (zh) 2012-01-09 2012-01-09 顯示驅動裝置及顯示面板的驅動方法

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TWI622041B (zh) * 2017-08-24 2018-04-21 友達光電股份有限公司 信號遮罩單元、信號遮罩方法及顯示面板

Citations (3)

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US20060044251A1 (en) * 2004-08-26 2006-03-02 Hirofumi Kato Flat display device and method of driving the same
US20070247478A1 (en) * 2004-08-13 2007-10-25 Tpo Hong Kong Holding Limited Corp. Matrix Addressing Circuitry and Liquid Crystal Display Device Using the Same
US20080036753A1 (en) * 2001-12-18 2008-02-14 Sharp Kabushiki Kaisha Display device and driving method thereof

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TWI317114B (en) * 2005-06-15 2009-11-11 Novatek Microelectronics Corp Panel display apparatus and method for driving display panel
TWI294604B (en) * 2005-06-15 2008-03-11 Novatek Microelectronics Corp Display panel
TWI357588B (en) * 2006-12-26 2012-02-01 Novatek Microelectronics Corp Display panel and plane display device using the s
TW200830244A (en) * 2007-01-05 2008-07-16 Novatek Microelectronics Corp Display panel and display device using the same and control-signal driving method thereof
JP4204630B1 (ja) * 2007-05-30 2009-01-07 シャープ株式会社 走査信号線駆動回路、表示装置、およびその駆動方法
TWI404022B (zh) * 2008-05-08 2013-08-01 Au Optronics Corp 驅動一液晶顯示裝置的方法

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Publication number Priority date Publication date Assignee Title
US20080036753A1 (en) * 2001-12-18 2008-02-14 Sharp Kabushiki Kaisha Display device and driving method thereof
US20070247478A1 (en) * 2004-08-13 2007-10-25 Tpo Hong Kong Holding Limited Corp. Matrix Addressing Circuitry and Liquid Crystal Display Device Using the Same
US20060044251A1 (en) * 2004-08-26 2006-03-02 Hirofumi Kato Flat display device and method of driving the same

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